The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

The place where Czar Peter I of Russia resided in 1697 during his Grand Embassy.

A Dutch clog company in the town of Zaandam loves the wooden shoes so much it made a museum for them.

Colorful and chaotic stacked hotel in North Holland.

The last of Amsterdam's original sea level markers remaining in place.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

This unusual elevator doesn’t stop or slow down.

Amsterdam's former hotspot for public executions and dissections.

A public urinal so pretty, it was declared a national monument.

The largest collection of handbags in the world, the oldest of which were used to carry Bibles, primarily by men.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

A beautifully eclectic mix of architectural styles.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

A floating cat sanctuary on an Amsterdam canal.

Museum preserving torture methods from the past.

A 16th-century footpath said to be haunted by a young girl that died trapped within its misshapen old house.

You won't find these curiously named passageways anywhere else in England.

The western face was supposedly left clock-less to snub the Welsh.